网络资源管理与检索作业(精选).doc

1、检索课题名称：新型超导材料的研究 2、课题分析：“超导材料”是课题中的主体，“新型”属于“超导材料”的限定词，故也要考虑其中。由此得出如下检索词（按其对课题影响程度排序）： 中文关键词：1超导材料 2新型 英文关键词：（1） Superconducting materials （2）new system 3、选择检索工具：Elsevier数据库? 4、构建检索策略：?Superconducting materials AND new system 5、简述检索过程:? 选定在?Elsevier?中期刊、图书、文摘数据库等全部文献资源中检索?2002?年以后的关于超导材料的相关文献。 利用确定的检索策略（Superconducting materials AND new system） ，文献全文（含文献题目、摘要、关键词）中检索，检到??14202篇相关文献；在文献题目、摘要和关键词中检索，检索到?68篇相关文献；在文献关键词中检索到?2篇相关文献；在文献题目中检索到?1?篇相关文献。? 6、整理检索结果： 从以上文献中选择出3?条切题文献? 1．Elastic properties and inter-atomic bonding in new superconductor from first principles calculations Solid State Communications, Volume 151, Issue 9, May 2011, Pages 671-673 I.R. Shein, A.L. Ivanovskii Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, 620990, Ekaterinburg, Russia Received?24 December?2009?? accepted?July?2010.? Available?online?12 December?2010. Abstract： Very recently [J. Guo, S. Jin, G. Wang, S. Wang, K. Zhu, T. Zhou, M. He, X. Chen, Phys. Rev. B 82 2010 180520R. arXiv:1012.2924.] the first 122-like ternary superconductor KxFe2Se2 with enhanced was discovered. This finding has stimulated much activity in search of related materials and triggered the intense studies of their properties. Indeed already in 2010–2011 the superconductivity was also found in the series of new synthesized 122 phases such as CsxFe2Se2, RbxFe2Se2, TlK xFeySe2etc. which have formed today the new family of superconducting iron-based materials without toxic As. Here, using the ab initio FLAPW-GGA method we have predicted for the first time the elastic properties for KFe2Se2 and discussed their interplay with inter-atomic bonding for this system. Our data reveal that the examined phase is a relatively soft material. In addition, this system is mechanically stable, adopts considerable elastic anisotropy, and demonstrates brittleness. These conclusions agree with the bonding picture for KFe2Se2, where the inter-atomic bonding is highly anisotropic and includes